KDE isn't very smooth on good hardware, what gives?

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https://bbs.archlinux.org – Hi everyone,I've been attempting to switch to linux full time again for a few months now on the desktop and the only thing holding me back since tf2 was ported is how damn slow kde is. I'm on reasonably modern hardware, xeon E3-1230v2, 16GB ram, GTX 680 4GB, samsung 840 pro, 3x 30" monitors using the nvidia binary driver with twinview. I know my hardware can handle this. The problems i experience range from window re-sizing not being fluid, with noticeable lag, choppy scrolling in chromium, things like that which definitely should not happen. I experienced this exact behavior on (HowTos)